1 files changed, 2 insertions, 2 deletions
diff --git a/struct.c b/struct.c
index bae826bf80..a961ac8600 100644
--- a/struct.c
+++ b/struct.c
@@ -435,7 +435,7 @@ num_members(VALUE klass)
  */
 
 static VALUE
-rb_struct_initialize_m(int argc, VALUE *argv, VALUE self)
+rb_struct_initialize_m(int argc, const VALUE *argv, VALUE self)
 {
     VALUE klass = rb_obj_class(self);
     long i, n;
@@ -457,7 +457,7 @@ rb_struct_initialize_m(int argc, VALUE *argv, VALUE self)
 VALUE
 rb_struct_initialize(VALUE self, VALUE values)
 {
-    return rb_struct_initialize_m(RARRAY_LENINT(values), RARRAY_PTR(values), self);
+    return rb_struct_initialize_m(RARRAY_LENINT(values), RARRAY_CONST_PTR(values), self);
 }
 
 static VALUE